Originally Posted by
Vendee
I'm reminded of the A340 ground incident at Toulouse during a high power engine run when the engineer pulled a CB to silence a noisy config warning. Unfortunately, the CB in question (ground proximity sensor) corrected the config error by putting the aircraft in a flight configuration, which meant releasing the parking brake. No chocks were fitted and the aircraft was destroyed.
Think it was not the engineer actually in charge of the run that pulled the cb, but someone else who was in a party of observers from the customer.
And as for holding tripped CB's In, if they keep tripping, well you can if you just want to exercise your fingers, for many years they have had to be trip free ( IE if tripped, and the condition that caused it is still present, will stay tripped internally even if one keeps a pudgy finger on it) in aviation applications.
Ttfn
Ttfn